matt-up vs felt

matt-up is not a noun while felt is a noun.

Word	Noun	Adjective	Verb	Adverb
matt-up	No	No	Yes	No
felt	Yes	No	Yes	No

As verbs, matt-up and felt are synonyms defined as:

Other synonyms of matt-up include felt up, mat, mat up, matte, matte up.

matt-up (noun)	felt (noun)
	a fabric made of compressed matted animal fibers

matt-up (verb)	felt (verb)
change texture so as to become matted and felt-like	change texture so as to become matted and felt-like
	cover with felt
	mat together and make felt-like